// outside.js

const ctx = '@@clickoutsideContext';

export default {
  bind(el, binding, vnode) {
    const ele = el;
    const documentHandler = (e) => {
      if (!vnode.context || ele.contains(e.target)) {
        return false;
      }
      // 调用指令回调
      if (binding.expression) {
        vnode.context[el[ctx].methodName](e);
      } else {
        el[ctx].bindingFn(e);
      }
    };
    // 将方法添加到ele
    ele[ctx] = {
      documentHandler,
      methodName: binding.expression,
      bindingFn: binding.value,
    };

    setTimeout(() => {
      document.addEventListener('touchstart', documentHandler); // 为document绑定事件
    });
  },
  update(el, binding) {
    const ele = el;
    ele[ctx].methodName = binding.expression;
    ele[ctx].bindingFn = binding.value;
  },
  unbind(el) {
    document.removeEventListener('touchstart', el[ctx].documentHandler); // 解绑
    delete el[ctx];
  },
};
